<![CDATA[Penelitian pengembangan ini bertujuan menghasilkan Lembar Kerja Peserta Didik (LKPD) berbasis Project Based Learning (PjBL) pada materi perubahan lingkungan yang layak ditinjau dari aspek kevalidan, kepraktisan, dan keefektifan untuk melatihkan keterampilan berpikir kreatif siswa. Model pengembangan yang digunakan adalah Research and Development (R&D) dengan alur 4D (Define, Design, Develop, Disseminate). Produk ini diujicobakan kepada 34 siswa kelas X SMA Negeri 14 Surabaya. Kepraktisan LKPD ditinjau berdasarkan pengamatan keterlaksanaan aktivitas dan respon siswa, sedangkan keefektifan diukur melalui ketuntasan hasil belajar serta ketercapaian indikator berpikir kreatif. Seluruh data dianalisis menggunakan teknik deskriptif kuantitatif. Hasil uji validitas menunjukkan LKPD memperoleh skor 95,97% dengan kategori sangat valid. Tingkat kepraktisan mencapai 100% berdasarkan keterlaksanaan aktivitas dan 94,67% berdasarkan respon siswa, sehingga masuk kategori sangat praktis. Keefektifan LKPD menunjukkan hasil signifikan dengan perolehan skor N-Gain hasil belajar sebesar 0,72 dan indikator berpikir kreatif sebesar 1,34, di mana keduanya termasuk dalam kategori tinggi. Dapat disimpulkan bahwa LKPD berbasis PjBL pada materi perubahan lingkungan yang dikembangkan layak digunakan dalam proses pembelajaran. Kata Kunci: LKPD, Project Based Learning (PjBL), Perubahan Lingkungan, Berpikir Kreatif. This development research aims to produce Student Worksheets (LKPD) based on Project-Based Learning (PjBL) on the topic of environmental change that are suitable in terms of validity, practicality, and effectiveness for developing students’ creative thinking skills. The development model used is Research and Development (R&D) following the 4D process (Define, Design, Develop, Disseminate). This product was pilot-tested with 34 tenth-grade students at State High School 14 Surabaya. The practicality of the worksheets was assessed based on observations of the implementation of activities and student responses, while effectiveness was measured through the achievement of learning outcomes and the attainment of creative thinking indicators. All data were analyzed using quantitative descriptive techniques. The validity test results showed that the worksheets achieved a score of 95.97%, falling into the “highly valid” category. The level of practicality reached 100% based on the implementation of activities and 94.67% based on student responses, thus falling into the “highly practical” category. The effectiveness of the worksheets showed significant results with an N-Gain score for learning outcomes of 0.72 and a creative thinking indicator score of 1.34, both of which fall into the high category. It can be concluded that the PjBL-based worksheets on the topic of environmental change that were developed are suitable for use in the learning process. Keywords: LKPD, Project-Based Learning (PjBL), Environmental Change, Creative Thinking.]]>
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